Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

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"People always ask me how many bottles of champagne will be consumed, but on Cup Day there's 4000 accredited hospitality staff working with Peter Rowland Catering, included in that number there's probably 1000 chefs working on the course.

"When you think of the number of vehicles coming on and off the track it could be up to 2000 vehicles a day before the carnival begins."

Preparations for next year's carnival have already begun.

"Not saying we're making chicken sandwiches today for next year, but it's the logistics which are already underway," Mr Rowland said.

In the days leading up to Derby Day on Saturday, there's about 20 trucks coming onto and off the course delivering food every two hours.

About 200 carpenters, 200 painters and 200 electricians are working solely on the finishing touches in the Birdcage marquees.